In High-Med gas cell looking at focus, it appears we lost way. After backing out the mirrors and confirming their locations, comparing pumped and really, really pumped gas cell data, and doing more grids than you can shake a stick out, I like echelon/echelle position 22/5. A couple figures to back up my assertion.
Our data were (in tabular form)
ECHELLE TURNS
E 1 2 3 4 5
C 22 X X X
H 23 X X X
E 24 X X X X
L 25 X X
O 26 X X X
The figure above is the FWHM in X and Y as a function of Detector Column for all "roundish" points (see lower right panel) with various cuts. Upper Right panel is color-coded by Echelon Mirror position. Upper Left is coded by Echelle Mirror Position. The yellow points near column 200 and FWHM ~9 pixels look tasty. I'm not showing other plots that included less rounded spots - this one seems to show the result most clearly.
The two figures above show the sum of "left-center-right" gas cell positions for 22/4, 22/5, 23/4, and 23/5 with the greyscale set to +- 80% of the 99.5%ile value. The right hand figure shows the residuals for these same echelon/echelle subtracting the fit from the data. The grey scale is +-50% of the 99.5%ile value established in the left hand figure.
After seeing these points, I asked Curtis to increase our grid. I'd like it end up as:
ECHELLE TURNS
1 2 3 4 5 6 7
E 20 O O
C 21 O O O
H 22 X X X O
E 23 X X X
L 24 X X X X
O 25 X X
N 26 X X X
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